Telephone-transmitter.



P. GOTTSGHALK.

TELEPHONE TRANSMITTER.

` APPLIGATION FILED FEBJZ, 1910.

Patented Dea-6,1910.

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P. GOTTSCHALK.

TELEPHONE TRANSMITTER. 'l APPLIOATION FILED 1f.1a.1z ,191o.

Patented Dec. 6, 1910.

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l INVENTOR,

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FELIX GOTTSCHAJK, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

Specification of Letters Patent.

Patented Dec. 6, 1910.

Application led February 12, 1910. Serial No. 543,503.

To all whom it may concern:

Be it known that I, FELIX GoTrsoHALK, a citizen of the United States ofAmerica, and resident of New York, in the county of New York and Stateof New York, have invented certain new and useful Improvements inTelephone-Transmitters, of which the following is a full, clear, andexact description.

The object of this invention is to improve a telephone transmitter ofthe Bell orother analagous type and especially with respect toarrangements and provisions therein and therefor for rendering theinstrument more sanitary than one provided with the usual forwardlyextending and flaring mouth piece which is undeniably a collector ofdirt, and germs carried thereinto by the moisture of the breath andotherwise.

In my endeavors to produce a sanitary and efficiently operativetelephone transmitter in which the black rubber or otherwise constitutedforwardly projecting funnel-shaped mouth-piece is excluded, I haveemployed, in an interposed relation between the resistance cup and thecircular aperture in the front of the transmitter casing, a forwardlyflaring cup-shaped shell receiving the impact and for serving as amedium for carrying the sound wave vibrations for operat-ive elfect uponthe front electrode; and as a means for the retention of the forwardlyflaring cup-shaped shell in its place in the instrument, the same hasbeen formed with an aperture through its back or base and engaged abouta screw threaded stud which is supported by and forwardly projected fromthe front electrode, the confining nut being screwed on the stud againstthe back of the shell, and a substantially conical member has also beenprovided to inclose and conceal the nut; and a telephone transmitter ofthis description is illustrated, described and claimed in Letters Patentof the United States about to be issued to me under date of February22nd, 1910, No. 950,229 to which reference may be had as an examplemerely of a form of telephone transmitter in conjunction with which theguard, constituting the present invention may be used, it being,however, clearly understood that such guard is available on transmittersotherwise than like that referred to in my patent, and, such, forinstance, as the ordinary Bell transmitter at this time in veryextensive use, in which case my guard becomes a substitute for theforwardly Haring mouth piece.

The present invention, therefore, especially includes improved meanswhich without interfering in any way with the speech reproducingcapabilities of the transmitter will serve as a guard to effectuallyprevent the tampering by malicious or inconsiderate persons with thedevices in the instrument requiring to be more or less delicatelyadjusted, such as the diaphragm and parts intimately combined therewithor appurtenant thereto. And the improved guard, in which this invent-ionresides, is fully and clearly described in conjunction with theaccompanying drawings and set forth in the claims.

In the drawings Figure l is substantially a central sectional view on asomewhat enlarged scale, from front to rear, through a telephonetransmitter with the present improvements embodied therein. Fig. 2 is afront elevation of the instrument. Fig. 3 is a front elevation of theguard for the apertured front of the instrument, shown as modified indesign or detail but with no departure in any essential respect fromthat shown in the previous figures. Fig. 4 is a side elevation withparts in section of the ordinary Bell transmitter with the front guardtherefor represented as of a construction somewhat modified from the oneshown in Fig. l. F ig. 5 is a front elevation of Fig. 4.

Similar characters of reference indicate corresponding parts in all ofthe views.

In the drawings, A represents the rear portion of the casing of thetransmitter, and A2 the front portion of the casing, the same beingpartially telescoped by the part A and connected by the screws a whichhave their location behind the annular bead or peripheral rib l).

B represents the resistance cup supported by the bridge C, and Drepresents the diaphragm located behind the front wall of the casing,through which wall is the central aperture (Z.

g represents a screw t-hreaded stud having an anchorage or supportingengagement in the front electrode c provided in the resistance cup B andthe diaphragm D which is centrally perforated is engaged about the studas is also the bach or base portion of the shell F which is of aforwardly opening cup or dish shape,-the back of this shell being, ofcourse, also perforated to permit of the projection therethrough of thestud.

One or more locking nuts are provided in screw engagement on the studfor clamping the shell F to the diaphragm and both the shell and thediaphragm to proximity with, or contact against the electrode e; and theforward end of the stud and the nut or nuts /L are inclosed andconcealed by an approximately conical shaped chambered member i, and allmore or less similar to arrangements of the corresponding parts setforth in my aforementioned Letters Patent of Feb. 22nd, 1910, No.950,229.

G represents the guard secured in a firm and stable manner on the frontof the instrument and serving as means, most especially, for preventinga person tampering with the securing and adjusting devices for the cupshaped shell combined with the diaphragm, or with the diaphragm howeverconstituted and whether by a single element or associated parts. Asrepresented in Figs. 1 and 2, this guard consists of a centralizedforaminous member m,-the perforations m2 being comparatively large orsmall as may be elected,and, rearwardly and radially extended therefrom,supporting arms n n of suitable number, and preferably equi-distant fromeach other, said arms at their return bent extremities being formed withoffsets, as at 0 to engage about and embrace the peripheral beads Z) ofthe casing; and said arms at their extremities as clearly represented inFig. l, are formed with eyes or perforations p for the engagementtherethrough of confining screws, which may be the same screws a asunite the separable sections of the transmitter casing. This guard,moreover, may have as a part or appurtenance thereof a portion orportions indicated at g which extends from the rear of the foraminousdisk shaped body rearwardly toward the front wall of the transmitter andis eective to defeat the attempts of a person to introduce any long thinobject into the speech entrance opening in the front of the instrument.This additional guard constituting provision g may be in the form of aplurality of rods or arms in separated relations, or it may beconstituted as designed to be represented in Fig. 4, by a rearwardlyprojecting annular wall g2 which terminates in proximity to the marginof the speech opening (Z in the front of the casing.

ln F ig, 4- the radially and rearwardly extending supporting arms forthe foraminous member are represented as having the offsets at theirextremities of such form and relation to each other as to permit theguard to be sprung to a snap-catch engagement with the beaded peripheralportion of the transmitter casing; and in Figs. 4 and 5 the foraminousportion of the guard is constituted by a disk shaped piece m2 of gauze,or other material having fitness to the purpose, marginally confinedbetween the ring frame m3 supported by the arms n and the screw engagedconfining ring s.

The front of the guard may be rendered suitably porous other than by theprovision of a plate m having circular perforations, as shown in Figs. land 2, or by the provision of a sheet of gauze or the like as describedin conjunction with Figs. 4 and 5; and in Fig. 3, the circular plateconstituting the front of the guard is shown as having a plurality ofslits which in this instance are of arc shape and in concentricarrangement, although slits of other shape and arrangement may bepracticably employed.

As will be manifest, a person of mechanical experience having aknowledge of the objects of this invention and the means substantiallyas described for its accomplishment may make many changes andmodifications in the forms and details of construction of the partswhich contribute to the production of the improved instrument withoutdeparting from the spirit of the invention or sacrificing the advantagesthereof.

1 claim l. The combination with a telephone transmitter casing of aguard consisting of a centralized foraminous member, and radially andrearwardly extending supporting arms, for said member, having eye-formedextremities which are arranged to embrace the casing, and screwsengaging through the eyes, and with the casing for the confinement ofthe guard on the instrument.

2. A telephone transmitter having an aperture in the front of itscasing, with 'a diaphragm adjacent the aperture, and a guard comprisinga centralized foraminous member having its location forward of saidaperture, an outwardly and rearwardly extending arm by means of whichsaid member is supported on the cas-ing, and arms extending from therear portion of the guard in a surrounding relation and in proximity tothe apertured front of the casing.

3. A telephone transmitter having an aperture in the front of its casingand a diaphragm adjacent the aperture, and a guard comprising a`centralized foraminous member having its location forward of said ap-.

erture, means for supporting it externally on the casing, and an annularWall extending rearwardly from the front of the guard to proximity tothe apertured front Wall.

4. The combination with a telephone transmitter casing having anapertured front, and a diaphragm adjacent the aperthe aperture forpreventing tampering With 10 the diaphragm and exposed appurtenancesthereof.

Signed by me at Springeld, Mass., in presence of two subscribingWitnesses.

FELIX GOTTSCHALK.

ture, of a guard supported on the front of Witnesses: the instrument anda plurality of arms WM. S. BELLoWs, terminating in proximity to themargin of G. R. DIusCoLL.

